A berzerker glaive and Feel No Pain combined with Stature will make your lord very cheap and very tough to kill in a low point game. Give him essence and a collar of khorne, and just let him go! Avoid S10! In this low of points, he'll be pretty unstoppable.
The regular berzerkers themselves cannot be given equipment from the armory, so they cannot have Feel No Pain. The champs can though! Also remember that in this low of points, you can just run your marines with no mark and maybe infiltrate. Let the Lord and the dread or pred do all the work.
Khornate Chainaxes rock! Also don't forget the frag grenades. They will save you a huge headache when you have to charge into cover. Powerfists on champs work good.
A dreadnought with 2 CCW's is about worthless, because when he fire frenzies, he usually will have SOMETHING in range to shoot with his combi-bolter, so he'll stand still. I always give a dread a decent gun, like an autocannon or lascannon, so at least when he fire frenzy's he does something interesting.
A predator will serve you very well for anti-tank.
This is what I would take for 750
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750 World Eaters
Demon Prince with MoK, Stature, Essense, Feel No Pain, Berzerker Glaive, Collar of Khorne and Frag Grenades (156)
8 Berzerkers (188) Free Aspiring Champion with Powerfist and ToBB, 'zerkers with Khornate Chain Axes and frag grenades Mounted in Rhino with Smoke and Extra Armor (58)
8 Berzerkers (188) Free Aspiring Champion with Powerfist and ToBB, 'zerkers with Khornate Chain Axes and frag grenades
Dreadnought (160) with Twin Lascannon, Mutated Hull and Extra Armor
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Another trick would be to run two cheap lieutenants with Demonic Speed and Lightning Claws, and then have them run towards the enemy while your 'zerkers and dread attempt to draw fire.